Hospital visits can be complicated things. Sometimes it starts out as a visit to the outpatient clinic, where a doctor draws blood or orders some scans to investigate your niggling concern. He phones you the following week with the results — they don’t look good — and schedules a minor operation. You get admitted, have the procedure, and get discharged with tablets and therapy to follow up.

In Greek mythology, Erebus is the primeval god of darkness, son of Chaos. It’s also the region of the underworld, where souls pass through after dying. The word is so evocative of gloom and shadows that naming one of the most dangerous types of Bitcoin attacks after it seems only fitting.

This is a scenario that’s probably familiar to many of us: You touch down at your long-awaited holiday destination, collect your luggage, and step outside the airport, raring to go. Now you need to find your way to the Airbnb, so you whip out your phone and plug the address into Google Maps. Or Apple Maps, or Waze, or MapQuest, or Maps.Me, or HERE WeGo.

If you’ve ever had an MRI done, you would know that it’s not the most comfortable experience. They can make you feel claustrophobic, you’ll often hear loud thumping or tapping noises, and you might have to hold your breath a couple of times. But for most people, the hardest thing about getting an MRI, or magnetic resonance imagining, scan is being forced to stay completely still — sometimes for up to 90 minutes at a time.