First Prehistoric Person

Using a new technique that makes it easier to precisely measure the number of chromosomes in ancient DNA, researchers have identified the earliest known cases of two genetic disorders.

Ancient DNA can provide us with useful insights into our ancestors, but unfortunately, samples can degrade or become contaminated over time, making it more difficult to analyze. One of the problem areas is in detecting differences in the number of chromosomes, such as extra or missing copies – this is known as aneuploidy.

To combat this, the research team developed a new computational method to detect more variation when counting the number of chromosomes, particularly the X and Y (also known as the sex chromosomes) in a human genome. Most human cells have 23 pairs of chromosomes, including the sex chromosomes. Females usually have two Xs (XX), whilst males have an X and a Y (XY).     READ MORE...

Blob Outside of Space Station

Cosmonauts on board the International Space Station (ISS) conducted a spacewalk in order to fix a leaking radiator on Wednesday.


The leak, confirmed earlier this month by Russian space agency Roscosmos, came from the backup radiator mounted on the outside of the Nauka module launched in 2021. The main radiator remains operational, but Rosmocos scheduled in a spacewalk to fix the problem.

Inspecting the source of the leak, Oleg Kononenko reported seeing a number of holes on the radiator panel.

"The holes have very even edges, like they've been drilled through," Kononenko told Moscow Mission Control, Space.com reports. "There are lots of them. They are spread in a chaotic manner."

The cosmonauts were equipped with a cloth towel to soak up any escaping liquid, but Kononenko was told to leave the area immediately after encountering a blob of coolant, which had moved onto his safety tether.  READ MORE...

Sperm Breaks Law of Motion

The laws of physics have been broken (or appear to have been broken) by all manner of things, from balancing rocks to Seinfeld’s apartment, and now, by human sperm. The latest law-breakers defy Newton's third law of motion, distorting their bodies as they swim in a way that elicits no response from their surroundings.

Newton's third law states that when one object exerts a force on a second object, the second object exerts an equal and opposite force back. In other words, “for every action, there is an equal and opposite reaction”. However, for biological swimmers such as sperm, this may not be the case.  READ MORE...

FOUR-THOUSAND-Year-Old Mummy

The false door to Ptahshepses’s tomb was removed by a French archaeologist in the 19th century. Now, 160 years later, researchers have rediscovered it and found the mummy of its occupant. Image courtesy of © Archive of the Czech Institute of Egyptology, Faculty of Arts, Charles UniversityThe false door to Ptahshepses’s tomb was removed by a French archaeologist in the 19th century. Now, 160 years later, researchers have rediscovered it and found the mummy of its occupant.




A team of Czech archaeologists have rediscovered a lost tomb that belonged to an ancient Egyptian official called Ptahshepses, who lived around 4,400 years ago (during the 24th and 25th centuries BCE). The discovery even contained the mummified remains of this significant individual.

According to a statement released by the Czech Institute of Egyptology on Facebook, the lost tomb was discovered in the zone between the pyramid fields of Abusir and Saqqara, Egypt.

"It was a difficult search lasting several years,” Miroslav Barta, head of research at Abusir, explained in the statement. “Detailed satellite imagery of the area and the study of old maps led to the rediscovery of the tomb of Ptahshepses in 2022.”

Around 160 years ago, a French scholar named Auguste Mariette found this site and partially “excavated” it. Mariette extracted Ptahshepses’s false door, a symbolic doorway the Egyptians believed the deceased could use to enter and exit the tomb, and a lintel originally placed above the cult chapel. However, the tomb disappeared under the sand and was lost until now.

The artifacts recovered by Mariette are currently on display at the British Museum. The door itself provides an extensive and unique account of Ptahshepses’s career. It explains how he was educated at the court of the last Giza ruler – Menkaure (Greek "Mykerinos") – and how he later married the daughter of pharaoh Userkaf. Userkaf himself was an important figure who founded the Fifth Dynasty of Sun Kings.

“This reference itself indicates that Ptahshepses is the first known official of non-royal descent in Egyptian history who was given the privilege of marrying a royal daughter,” the Institute explained.  READ MORE...

Image courtesy of © Archive of the Czech Institute of Egyptology, Faculty of Arts, Charles University

Expansion of Universe Nearing End

The universe is not only expanding, but accelerating that expansion, leading most scientists to anticipate it will keep on growing for a very long time, if not forever. However, a trio of Princeton physicists have challenged this view, presenting a model of the universe in which this expansion is nearly at its end. The universe will start to contract in on itself, they claim, and that could happen surprisingly soon. This is a cosmologist’s “soon”, however, of the order of 100 million years, not something most people would recognize as imminent.

The discovery of acceleration in the expansion of the universe has shaken up cosmology perhaps more than anything else this century. Beforehand the primary debate was whether the universe would expand forever, albeit more slowly, or be dragged back into a “big crunch” as gravity overcame the movement apart.

Acceleration, and the Dark Energy used to explain it, appeared to end the possibility the universe would ever contract again, but a minority of physicists aren't ready to let the idea go. Professor Paul Steinhardt, in particular, has proposed “bouncing” models of the universe. Now Steinhardt and co-authors claim in Proceedings of the National Academy of Sciences that the turning point from expansion to contraction could be close without us being able to tell.

The authors do not assert certainty. They refer to three models of Dark Energy's nature. One of these would see the universe continue to expand faster and faster forever, while a second would see it slow at an unpredictable point, probably far in the future.  READ MORE...