Pet food is a multi-billion-dollar industry that consumes huge amounts of animal protein. A veterinary nutrition specialist explains how to feed dogs and cats healthily and sustainably.
In 1997, scientists announced they'd created a healthy sheep cloned from another ewe's mammary gland cell. Two decades on, the technique is being refined and applied to new challenges.
Dolly the sheep died young with osteoarthritis, but new evidence shows early-onset diseases aren't inevitable for clones.
No wonder scientists love it.