4,400 years old tomb found
• Archaeologists in Egypt discovered a 4,400-year-old tomb near Cairo that contains rare wall paintings and is believed to belong to a high-ranking priestess named Hetpet. The paintings depict traditional scenes: animals grazing, fishing, bird-catching, offerings, sacrifice, soldiers and fruit-gathering. Hetpet was a priestess for goddess of fertility, Hathor, who is depicted as a cow. The priestess is believed to have been close to ancient Egyptian royals.
Sour and ear
• How do we know when we bite into a lemon that it is sour? Biologists have recently identified a protein that is key to detecting sour flavours. The strange thing is that the protein, Otop1 was previously identified in the inner ear, where it is required for developing a sense of balance. That depends on tiny calcium carbonate crystals that rest on top of sensitive hair cells and dissolve in acid.
• For most prey, the game is over once they have been swallowed. But the bombardier beetle - found on nearly every continent - can escape from a toad's stomach nearly two hours after being eaten. The insects are named after their defence mechanism: when threatened, they shoot a hot chemical spray from their rear end. Once eaten, they fire their poison inside the toads who are then forced to vomit them out. This process may take a while but even if it had entered the toads' digestive system, the beetle usually survives.