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Katy Perry almost fell during her Lifetimes Tour concert on Friday, after her butterfly prop experienced a sudden malfunction. Scroll down to read what happened during the live performance.

A chemical and spectroscopic comparison of two purple gem spinel samples, one of them the first reported example of a spinel with a saturated purple color caused predominantly by chromium and cobalt.

A rare Purple Emperor butterfly has been spotted at The National Trust's Sheringham Park in north Norfolk for the first time in three years.

The purple emperor, with a wingspan of around 8cm, was sighted at Sheringham Park in Norfolk in June during a weekly survey to monitor butterfly populations over time. The National Trust said ...