Staying young, from the cells on up

Researchers at Université de Montréal and McGill University have discovered a new multi-enzyme complex that reprograms metabolism and overcomes "cellular senescence," when aging cells stop dividing.

The animals that sniff out TB, cancer and landmines

In a small, hot room in a compound located in Tanzania's lush southern highlands are three white-clad technicians, a glass-and-metal chamber and a large brown rat named Charles.