It seems there exists an established yet hidden cat calling system. According to scientists, cats identify one another through a shockingly durable chemical “calling card” made from 13 unusual fatty acids in their urine. Thus, feline friendships might have to do more with their identification than consistent meetings.Cats rely heavily on scent to learn about…

People take photos of the Sydney Opera House in Sydney, Australia. (Photo: Reuters) For the first time in the 2060s, deaths are projected to outnumber births in Australia, while annual population growth is expected to average 0.9% over the next four decades. Lower fertility and declining net overseas migration are expected to contribute to the…

Scientists at the University of Groningen in the Netherlands have discovered how tin-based perovskite materials allow hot electrons to retain their excess energy for around 1,000 times longer than expected, a finding that could shape the future of solar power. The researchers found that two physical effects, the hot phonon bottleneck and the Burstein–Moss effect,…