News

Health & Medicine

Add penis bacteria to the list of HIV risk factors

Certain bacteria found on the penis raise the risk of HIV infection, a new study finds.

Astronomy

Fewer big rogue planets roam the galaxy, recount shows

Jupiter-mass planets without parent solar systems are less common than astronomers thought, a new study suggests.

Chemistry

Radioactive substances leave electron ‘fingerprints’ behind

A new method of nuclear forensics could make it harder to handle radioactive material in secret.

Genetics

Resistance to CRISPR gene drives may arise easily

New tools for pest and disease control could become useless without improvements.