Polls close in the Corby by-election, while voting ends in two other Westminster seats and for police and crime commissioners in England and Wales.

The CIA opens an investigation into the conduct of its former director, David Petraeus, who resigned last week because of an extramarital affair.

Experts warn more research is needed to find out how to reduce the number of babies born early.

Tory peer Lord McAlpine said it was "terrifying" to find himself "a figure of public hatred" after he was wrongly implicated in child abuse allegations.

Baby tortoises have been given paternity tests to find out how sperm storage affects fertilisation.

Egypt's prime minister says Israeli attacks on Gaza are a disaster and must stop, shortly after he arrived in Gaza to offer support to Palestinians.

Nearly one in three people who train to be teachers in England does not go on to work in the profession, a report suggests.

Digital technology could transform education, but expensive kit often sits in boxes because teachers don't know how best to use it, a study claims.