Why do crabs walk sideways? Scientists trace it back 200 million years - Science Daily

It would be fair to say that design teams at SpaceX threw a lot of the rulebook out the window when they designed Starship, which is the most powerful rocket ever built. SpaceX's flagship rocket, which is still under developmental testing, was designed for missions that had never been attempted before. Starship is expected to carry payloads and crew to Mars at scale, and this required out-of-the-box thinking. It is for this reason that the Starship vehicle and Super Heavy booster had to be designed using a different approach. One of the most novel parts of any Starship flight is the landing, where the Starship vehicle glides on its belly through the upper parts of the atmosphere after reentry, then flips into an upright position for landing at the last possible moment. This is done to gradually slow it down, to manage reentry temperatures effectively, and to use a flip maneuver to get Starship into an upright position so it can land on the surface of Mars, or to be caught by SpaceX's Mechazilla launch tower arms back on Earth. SpaceX designed this flight profile (and designed Starship around the concept) for a good reason, which was to shed speed passively during reentry and to

The specimens were technically megalopae, which is the life stage between larvae and adulthood. Many organisms often set up their homes on sea turtles. Known as epibionts, the most noticeable passengers are usually the algae and barnacles clinging to the marine reptile’s protective shell. Other epibionts include tiny crabs in the Planes genus who frequently hitch rides inside the crevices between a turtle’s shell and body.

Deleting a conversation with an artificial intelligence (AI) assistant may not erase everything the assistant remembers. Georgia Tech researchers have developed a tool that can recover deleted conversations from AI assistants running on Android phones. The tool, called ORISA, can also rebuild the recovered information into a working AI session.

A facial mass detected before birth prompted the early delivery of identical twin sisters. A fetal MRI at 33 weeks showed the mass on one baby's face. When the sisters were born a week later, tumors were found in both. Two children had the same cancer, raising a question that their shared beginnings alone could not answer. Had the disease started separately in each sister, or had cancer cells crossed from one to the other before birth? Researchers turned to a record hidden within their cells. DNA changes, accumulated as their bodies developed, allowed the team to reconstruct events that had happened months before anyone saw a tumor. The study in Nature Communications shows that the cancer began in one sister and passed to the other in the womb, most likely through a single transfer late in the second trimester. The same investigation uncovered clues to how the sisters themselves had formed. The two girls, Amelia and Amaya, died soon after birth. Their family consented to post-mortem examinations for research. The authors dedicate the study to the sisters, whose mother wanted them acknowledged by name.