Hundreds of dead jellyfish weighing 10-15kg found on Cox’s Bazar Beach, according to experts in ocean ecology.

Sea ice helps prevent Earth from entering new ice age, says member of Turkish team on Arctic expedition.

Manned, unmanned space flights studies gain pace since US space agency began in 1958.

'People will never look at the sky the same way again,' says Brian Odom, NASA's acting chief historian.

Board says merger agreement fair, advisable for Twitter and stockholders.

Musk want platform to be more like Chinese super app WeChat; wants users 'entertained and informed'.