This Week in Science: A viral sensation is back in town, a sea monster's gigantic size is confirmed, Yellowstone installs a new pool, and much more!First up: 'Neil the seal' has returned to wreak havoc in the Tasmanian towns where he first achieved internet stardom. He's back and bigger than ever – in terms of both bulk and followers.Also this week:
A 'shadow' in evolution that could help us fight aging
Long-lost megalodon fossils rediscovered, confirming its size
The drawbacks of a common cancer prevention strategy
Menopause isn't retirement for ovaries after all
