“Normally, the valves in your veins make sure that blood flows toward your heart. But when these valves don’t work well, blood can also flow backwards. This can cause blood to collect (pool) in...

“Normally, the valves in your veins make sure that blood flows toward your heart. But when these valves don’t work well, blood can also flow backwards. This can cause blood to collect (pool) in...

Why cockpit audio deepens the mystery of Air India crash 2 hours agoSoutik BiswasIndia correspondent•@soutikBBCInvestigators have uncovered a chilling discovery in the preliminary investigation...

Moon dust 'rarer than gold' arrives in UK from China10 minutes agoGeorgina RannardClimate and science reporterKate Stephens and Tony JolliffeBBC climate and science teamTony Jolliffe/BBC NewsThe...