Meteorite hunters may have found the largest known chunk of the Bronze Age Kaali Meteorite.

Two Polish meteorite hunters, Filip Nikodem and Andrzej Owczarzak, have recovered what they believe to be a fragment of the Kaali Meteorite, a large body which impacted the Estonian island of Saaremaa about 3500 years ago. The piece is reported to weigh about 40 kg, with a second fragment weighing 15 kg also found. The largest potential fragment of the meteorite discovered to date weighed 5.7 kg, and was found by Filip Nikodem in the spring of 2024.

A 40 kg potential fragment of the Kaali Meteorite found in Estonia by two Polish Meteorite Hunters. Z głową w gwiazdach/Facebook.

The Kaali Impact Structures are a series of nine circular crater lakes on the island of Saaremaa, the largest of which has a diameter of 110 m and a depth of 22 m. These are thought to have been caused by an object with a mass of between 20 and 80 tonnes entering the atmosphere at a velocity of somewhere between 10 and 20 km per second, and exploding in a fireball between 10 and 5 km above the ground. This explosion is thought to have largely vaporised the bolide, as well as removing about 81 000 m³ of rock on the ground, and incinerating vegetation up to 6 km from the impact site.  

The lake in the main Kaali Meteorite Crater on Saaremaa Island. The crater is about 110 m across, but the lake only occupies the central part of it. Wikimedia Commons.

This is thought to have happened about 3500 years ago, when the island was occupied by a Bronze Age population, although attempts to date the site and meteorite fragments from it have produced dates of between 5600 and 400 BC. A Bronze Age arrowhead made from meteoric iron which was found in Switzerland in the 1870s has been linked to the Kaali meteorites on the basis of its metallurgy, making a date of around 1500 BC more plausible.

(a) Overview of the Mörigen arrowhead (A/7396). Note adhering bright sediment material. Remnants of an older label on the left of the sample number. Total length is 39.3 mm. ( b) Side view of the Mörigen arrowhead. Layered texture is well visible. Point is to the right. Thomas Schüpbach in Hofmann et al. (2023).

Prior to 2023, the largest fragment of meteorite found at the Kaali sites weighed 6.21 g. However, in the autumn of that year Filip Nikodem obtained a search permit for the area, and, using a metal detector, found a series of pieces of iron which he believed to be meteoric in origin. These were handed to the Estonian National Heritage Board, who sent them to the University of Tartu, where a rapid X-ray fluorescence analysis found that the iron pieces contained between 0.6% and 4.8% nickel, as well as traces of titanium and vanadium, which is typical of meteoric iron.

The four pieces of meteoric iron handed to the Estonian National Heritage Board  by Filip Nikodem in 2023. Kristo Oks/University of Tartu.

In the spring of 2024, Filip Kikodem returned to the Kaali Lakes, collecting several more fragments with a total mass of 10.5 kg, the largest of which weighed 5.7 kg, making it (at that time) potentially the largest chunk of the Kaali bolide ever discovered. However, despite requests from the Estonian National Heritage Board, these pieces have never been surrendered to them. Instead, the Estonian authorities believe that the pieces were taken to Poland, where they are being analysed at a Polish university. Furthermore, the National Heritage Board received a letter from a lawyer in Poland, asserting Nikodem's ownership rights over the meteorite fragments.

A 5.7 kg possible meteorite fragment found by Filip Nikodem at Kaali Lakes in the spring of 2024. Filip Nikodem.

In the autumn of 2024 Filip Nikodem returned to Kaali Lakes, this time accompanied by meteorite hunter Andrzej Owczarzak, who did not posses a permit to search in Estonia, and was therefore in breach of Estonian heritage laws. At this time concerns were raised by the Estonian newspaper Saarte Hääl, which observed that the original search permit had been given to Filip Nikodem in relation to a two week project run by the University of Tartu in 2017, in which metal detectorists were given a short training course by the university then allowed to collect fragments for a display at a visitor centre, with the collectors being allowed to keep some fragments as a reward.

Saarte Hääl also noted that suspiciously large chunks of 'Kaali Meteorite' had begun to be offered for sale in Poland, and that some Polish enthusiasts had raised concerns that these might be fragments of the more common Morasko Meteorite, which fell near Potsdam about 5000 years ago. The newspaper also noted that Estonian law provides no specific protection for meteorites found in the country, although there are some restrictions upon where a metal detector can be used. 

Following the announcement of these discoveries, Jüri Plado of the University of Tartu applied for funding for a study on the feasibility of changing the law to protect meteorites found in Estonia, reasoning that such large objects would be a significant piece of national heritage and ought to be studied at an institute within the country, but this application was rejected. 

Local farmers talked to by Saarte Hääl stated that the Poles had shown them permits and promised to take any material found to the University of Tartu. However, several expressed doubts that the iron found was in fact meteoric, as it came from shallow depths on farmland, likely to have been disturbed since the Bronze Age, and resembled bog iron (impure iron deposits which precipitate out of solution in boggy soils). The newspaper contacted Kristo Oks of the Estonian National Heritage Board, who confirmed that it would be impossible to tell the difference between bog iron and meteorites without laboratory analysis. 

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The Bahamas ends mother-to-child transmission of HIV.

The Bahamas has been recognised as having eliminated the mother-to-child transmission of HIV, according to a press release issued by the World Health Organization on 22 April 2026. The has been achieved through the establishment of a comprehensive universal healthcare system, and the implementation of an Elimination of Mother-To-Child Transmission program, which aims to eliminate the mother-to-child transmission of three diseases, HIV, Syphilis, Hepatitis B. Under the terms of this program, all expectant mothers are offered screening for these diseases, as well as treatments to prevent transmission to the child. The program has also included making available pre-exposure prophylaxis treatments for HIV, which prevent people becoming infected following an initial exposure, reducing the prevalence of HIV in the population. The Bahamas becomes the twelfth country in the Americas Region to have eliminated mother-to-child transmission of HIV.

The national flag of the Bahamas. St Kitts & Nevis Observer.

Human Immunodeficiency Virus, or HIV, is a form of Lentivirus which causes infections in Humans, spread through sexual intercourse or exchange of blood. Notably, the Virus infects the cells of the Human immune system, where it is hard for that immune system to attack, and eventually leads to a breakdown of the immune system known as AIDS (Acquired Immune Deficiency Syndrome), during which the body becomes vulnerable to a wide range of infections, including many by micro-organisms which are not usually pathogenic. 

Untreated, HIV invariably leads to AIDS, and AIDS is invariably fatal, but, as with Syphilis, HIV infections can go through long phases of dormancy, leaving infected people unaware that they have the disease. Neither an effective vaccine nor a cure for HIV has yet been developed, however, it is possible to suppress the infection with a combination of anti-viral drugs, allowing patients to lead relatively normal lives, as long as their supply of antivirals is not interrupted. Children born to mothers with HIV are not automatically infected, as the Virus is usually unable to cross the placenta, but there is a high chance of infection during birth if the mother is not receiving treatment.

Scanning electron microscope image of an HIV virion. Hockley et al. (1988). 

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The Eta Aquariid Meteor Shower.

The Eta Aquariid Meteor Shower will peak before dawn on Wednesday 6 May 2026, with up to 45 meteors per hour at it's peak, radiating from the constellation of Aquarius. The radiant point of this shower does not spend long above the horizon in the Northern Hemisphere at this time of year, but is often a good display in the Southern Hemisphere between midnight and dawn. The Eta Aquarids are potentially visible between 19 April and 28 May, but are extremely hard to spot away from the peak of activity. With the last Quarter Moon in Sagittarius, pre-dawn viewing may suffer from some light interference. 

The radiant point (point from which the meteors appear to radiate) of the Eta Aquariid Meteors. Universe Today.

Meteor showers are thought to be largely composed of material from the tails of comets. Comets are composed largely of ice (mostly water and carbon dioxide), and when they fall into the inner Solar System the outer layers of this boil away, forming a visible tail (which always points away from the Sun, not in the direction the comet is coming from, as our Earth-bound experience would lead us to expect). Particles of rock and dust from within the comet are freed by this melting (strictly sublimation) of the comet into the tail and continue to orbit in the same path as the comet, falling behind over time.

The Earth passing through a stream of comet dust, resulting in a meteor shower. Not to scale. Astro Bob.

The Eta Aquarid Meteor  Shower is caused by the Earth passing through the trail of Halley's Comet, where it encounters thousands of tiny dust particles shed from the comet as its icy surface is melted (strictly sublimated) by the heat of the Sun. Halley's Comet only visits the inner Solar System every 75 years (most recently in 1986 and next in 2061), but the trail of particles shed by it forms a constant flow, which the Earth crosses twice each year; in May when it causes the Eta Aquarid Meteor Shower and in October when it causes the Orionid Meteor Shower.

Halley's Comet imaged on 8 March 1986 from Easter Island. William Liller/International Halley Watch Large Scale Phenomena Network/NASA/Wikimedia Commons.

Halley's Comet has been observed repeatedly and recognised as the same recurring object since at least 240 BC. However, it takes its modern name from the eighteenth century English Astronomer Edmund Halley, who determined the comet's periodicity in 1705.

Halley's Comet completes one orbit every 75.32 years (27 509 days) on an eccentric, orbit tilted at 162° to the plane of the Solar System (i.e. a retrograde orbit, at an angle of18° to the plane of the Solar System, but travelling in the opposite direction to the majority of the objects in the Solar System), that takes it from 0.56 AU from the Sun (59% of the average distance at which the Earth orbits the Sun, and inside the orbit of the planet Venus) to 35.1 AU from the Sun (35.1 times as far from the Sun as the Earth, and outside the orbit of the planet Neptune). As a comet with a period of more than 20 years but less than 200 years, Halley's Comet is considered to be a Periodic Comet, and a Halley-type Commet.

The orbit of Halley's Comet. Nagual Design/Wikimedia Commons.

Halley's Comet was visited by the European Space Agency's Giotto Probe in and Russian Vega 1 and Vega 2 probes March 1986, which were able to determine that the nucleus of the comet was only 15 km across, although it was surrounded by a coma about 100 000 km in diameter, made up of fragments of dust and ice released from the surface as it was heated by the Sun, causing the ices on its surface to sublimate (turn directly from solids to gasses), and that this material comprised 80% water, 10% carbon monoxide, 2.5% methane and ammonia, as well as trace amounts of more complex hydrocarbons, iron and sodium.

Halley's Comet imaged by the Giotto Probe on 14 March 1986. European Space Agency/Wikimedia Commons.

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World Malaria Day.

World Malaria Day is marked on 25 April each year, with the aim of raising awareness of both the disease and efforts to combat it. The day was originally adopted as Africa Malaria Day in 2001, following the signing of the Abuja Declaration at the African Summit on Malaria in 2000. This was adopted as an international observance at the 60th session of the World Health Assembly in 2007.

On World Malaria Day in 2026 the World Health Organization will be launching the campaign 'Driven to End Malaria: Now We Can. Now We Must.', which marks the fact that for the first time ever, ending Human Malaria is a genuine possibility. This includes the development of vaccines for Malaria, which are now being rolled out in 25 countries, as well as the development of genetically modified Mosquitoes which cannot spread the disease, improved Mosquito nets which are infused with dual action insecticides, seasonal chemoprevention measures which are now being offered to 54 million children in countries where Malaria is endemic, a widening of access to perennial (year round) chemoprevention, and better treatments for patients with Malaria.

Official World Malaria Day 2026 logo. World Health Organization.

Malaria is caused by parasitic unicellular Eukaryotes of the genus Plasmodium, and affects a wide range of terrestrial Vertebrates. Five different species of Plasmodium can cause Malaria in Humans, with most infections caused by either Plasmodium falciparum or Plasmodium vivax. The parasites are primarily spread via the bite of the female Anopheles Mosquitoes (males do not bite), but can also be spread through blood transfusions, organ transplants, or practices such as needle-sharing.

Photomicrograph of a blood smear containing a macro- and microgametocyte of the Plasmodium falciparum parasite. Both macro- and microgametocytes are products of the erythrocytic life cycle. Within a few minutes after the Anopheles sp. vector ingests the gametocytes, microgametocytes develop into microgametes, which are able to fertilize gametes. Centers for Disease Control and Prevention/Wikipedia Commons.

Malaria manifests with approximately 10-15 days after infection, as a fever, headache, and chills. Mild cases often pass soon, and can be difficult to identify as Malaria, however, more severe cases can be fatal in as little as 24 hours after the onset of symptoms. 

To date, 47 countries have been declared Malaria-free, with another 46 countries reporting less than 100 000 cases of locally acquired Malaria in 2024 (the last year for which reliable figures are available). Of those 46 countries, 37 reported less than 1000 cases, 26 reported less than 100 cases, and 24 reported less than 10.

Nevertheless, the situation is not all progress; 610 000 people died as a result of Malaria in 2024, an increase on the 598 000 who died in 2023. Four countries (Eritrea, Rwanda, Tanzania, and Uganda) have reported the emergence of strains of Malaria resistant to Artemisinin, the main treatment for the disease. Furthermore, 48 countries have reported Mosquitoes developing resistance to pyrethroid insecticides, which are the most commonly used to treat Mosquito nets hung over beds. Many strains of Malaria have also emerged which lack the pfhrp2 gene, which is used in diagnostic kits, delaying treatment in many cases. The Mosquito Anopheles stephensi, which is endemic to India, has been spreading in Africa in recent years. This Mosquito caries Malaria, and is a preferential urban-dweller, placing many people at greater risk.

Another serious threat is a massive shortfall in funding for Malaria programs, with US$5.4 billion in funding (more than half the total) being cut in 2025, with the United States, the United Kingdom, Germany, France, and Japan all making significant cuts to their aid programs. This has served to underline the fragility of aid programs which are reliant on the good will of a small number of wealthy donor countries.

Malaria eradication programs have also stalled due to civil conflicts and natural disasters, with major flooding events, which often co-occur with Malaria outbreaks, becoming more common due to the warming climate.

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The Temple of the Mud God.

Archaeologists working at a site on the northeastern fringe of the Nile Delta have uncovered what they believe to be a temple to a god of mud, according to a press release issued by the Egyptian Ministry of Tourism and Antiquities on their Facebook page. The site, which lies within the ancient city of Pelusium (or Blozium), a name which itself means 'mud', was first identified in 2019, when a portion of a red brick circular structure was uncovered, something which was originally identified as a possible Senate building, dating from the cities Greek or Roman period.

A section of the red brick wall surrounding the temple complex at Pelusium. Egyptian Ministry of Tourism and Antiquities.

When fully uncovered the structure proved to be a huge circular basin 35 m in diameter, with a plinth in the middle for a statue. This was connected to a system of cisterns and channels which would have carried salty, silt-laden water from the Pelusic Nile (the 'Muddy' Nile, one of the branches of the Nile Delta) into the basin, which has been interpreted as a religious centre for the God Pelusius, or Blozius, whose name meant 'mud' and who was the patron deity for the city.

The exposed temple site. Egyptian Ministry of Tourism and Antiquities.

The site is thought to have been in use from the second century BC until the sixth century AD, i.e. through the Greek and Roman periods of the city, and is being compared to other temples in the Hellenic and Roman worlds rather than to other Egyptian temples.

Archaeologists working on the temple site. Egyptian Ministry of Tourism and Antiquities.

The city of Pelusium was established as a port at the eastern margin of the marshes of the Nile Delta during the Egyptian Old Kingdom, but this port had silted up by the first century BC. Today, the city is several kilometres from the sea, and lies in the northwest Sinai Desert, cut off from the Nile Delta by the Suez Canal. The city was a significant border fortress to the Egyptians, and remained an important administrative centre during Roman times. It was noted for the production of flax and beer.

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