Tech expert Steve Caplin explains to Simon Rose why NASA believes the Moon should have its own time zone. NASA also plans to grow crops there in two years' time. Is space junk becoming dangerous to us on Earth? UFO spotters are turning their attention to the oceans. Amazon is ending its "just walk out" shops in the USA. NVIDIA is developing AI nurses while DrugGPT is hoping to provide doctors with second opinions. An Emo robot attempting to mimic human expressions turns out to be rather creepy. The invisibility shield is now available to buy. And Steve recommends an inexpensive micro sander kit for tricky angles. Learn more about your ad choices. Visit podcastchoices.com/adchoices