An easily-reversible form of male contraception has been successfully tested in rhesus monkeys, bringing it a step closer for humans.
The procedure involves injecting a gel into the tube that carries sperm out of the testicles, where it forms an impenetrable barrier.
A study involving rabbits last year showed the gel had the potential to provide an alternative to vasectomy, in which the tube is cut or sealed off.
The gel could be removed by flushing the duct with a baking soda solution.
Deaf mice hear again
Meanwhile, researchers in the United States say deaf mice have been able to hear a tiny whisper after being given pioneering gene therapy.
The team at Boston Children's Hospital used a harmless virus to transport a gene that fixes a specific form of hereditary deafness deep into a mouse's ear.
The researchers said the breakthrough could pave the way for gene-based treatments in people.
Genetic hearing disorders affect more than 100 million people worldwide, according to the World Health Organisation.