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Stem cells from human teeth have been coaxed into becoming sperm by injecting them into the testes of mice, claim researchers

A revolutionary portable NMR scanner in combination with magnetic nanoparticles can spot tiny amounts of bacteria in samples

Experts from 78 countries have called on governments to ban transplants of organs taken from vulnerable people

Many of the world's nutrient-poor ecosystems may turn out to be surprisingly resistant to the ecological effects of climate change

A promising new treatment in mice seeks out and destroys the blood vessels that nourish aggressive cancers without poisoning the whole body

A hormone which allows the placenta to push into the wall of the uterus in some primates might also have played a key role in brain evolution (full text available to subscribers)

Concerns that freezing embryos for IVF could be harmful may have been laid to rest by a study that finds fresh embryos actually do worse

Returning Mars rocks to Earth could be our best hope of answering long-standing questions about Mars and whether the planet ever hosted life

A gel made from pulped newspapers and chemicals is particularly good at reclaiming precious metals from industrial solutions, say researchers

"Pumping" data around a network could help sensors' batteries to last much longer by allowing them to switch off between beats

The next generation of the gasoline-electric hybrid car will be fitted with solar panels to power on-board electrical equipment, it is reported

The communicative mammals are famous for their giggling calls, but groans have been found to be an important facet of their vocal repertoire

This week's inventions include a more environmentally friendly way to remove tattoos, radiation dosage tests that don't need a medic to administer, and tough turbines for desert-bound jets

Low-lying Pacific islands may get a few unexpected decades safe from rising seas, but look out Europe and North America

Attractive people of the opposite sex are repulsive when you're in love, finds a study – perhaps so you gain a reproductive advantage

In a previously unsuspected relationship, the potter wasp goes as far as offering a home to a parasitic mite that helps fight off intruders at its nest

Quantum dots – tiny pieces of semiconductor – turn out to be extremely good at making deliveries inside living cells (full text available to subscribers)

The Pangaea supercontinent may have torn itself apart as it stretched to close up a gap occupied by an ancient ocean

Sex crime statistics often make depressing reading, but newly released figures from California show that very few sex offenders reoffend (full text available to subscribers)

Scientists face a dilemma over what action to take when an MRI scan finds something untoward in a study participant's brain (full text available to subscribers)