A new Nature Communications study has tracked these lulls in cassiopea jellyfish, which belong to a 500 million year-old ...

Turns out jellyfish and sea anemones – among the ancient creatures with a nervous system instead of a brain – have a very similar sleeping routine to our own. A new study published in Nature ...

One minute, you’re swimming in the sparkling water off the Queensland coast. The next minute, you’re fighting for your life.