How much power do GPUs actually consume? How might the moon still be geologically active? Could digital contact tracing ever really work in the US? These are the questions of the week and we've got answers. Pour yourself some coffee and read on.
Manual contact tracing — where those who test positive are interviewed about recent travel and person-to-person contacts — is expensive, hard to scale, and error-prone. So it is natural to see if digital technologies can help.