一项发布在《内科学年鉴》（Annals of Internal Medicine）上的新研究发现，每天一次长距离步行比多次短距离步行更有利于心脏健康，特别是对锻炼量较少的人来说。 The study looked at more than 33,000 adults aged 40 to 79 in the UK who walked fewer than 8,000 steps a day.

What if, his team pondered, there was some way to get a look inside the egg sac to see how a baby shark develops? Enter: the ...

Sharks play a critical role in maintaining balance throughout marine ecosystems. Scientists have found that their presence regulates prey populations and protects vulnerable habitats. When shark ...

Ghost sharks inhabit some of the darkest and least explored regions of the deep sea. Researchers have captured rare footage ...