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Some people in comas can understand what’s happening around them. Previously estimated to be 1 in 10, that figure has now shot up to 1 in 5 – meaning this hidden awareness is much more common than we realised.

Another new drug has been approved to reverse opioid overdoses. Zurnai is more powerful than previous medications, which may be useful as the supply of illicit drugs becomes increasingly toxic. But with the opioid epidemic having killed more than 80,000 people in the US last year alone, are there ways to abate this crisis so fewer people overdose in the first place?

The mysterious Wow! signal, detected by the Big Ear radio telescope in the 70s, was an unusual burst of radio waves that astronomers couldn’t explain – except, for some, the answer was aliens. Alien hunters have clung to this as the best potential evidence of extraterrestrial life, as the signal's origins have remained unexplained for 50 years. But we may have just figured out the answer to where it came from.

Many mainframe computers in big organisations like banks, airlines and government departments still rely on ancient computer code dating back to the 60s. The trouble is, as mainframe computers have gone out of use in most other contexts, the programming language COBOL is no longer taught to up-and-coming coders. Could AI help, as our understanding of COBOL dies out?

Record fast cooling in part of the Atlantic Ocean is baffling scientists. This cooling isn’t linked to the normal La Niña wind patterns, so what else is at play? And how could it affect our global weather in the coming season?

Hosts Rowan Hooper and Christie Taylor discuss with guests Alexandra Thompson, Grace Wade and Alex Wilkins.

To read more about these stories, visit newscientist.com.

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