How cold are black holes?

The very idea that a black hole could have a temperature strains the imagination. I mean, how can something that absorbs all the matter and energy that falls into it have a temperature? When you feel the warmth of a toasty ...

Tokyo smelling-screen demo lets scents go virtual

(Phys.org) —"Scent-delivery" technologies continue to interest marketers, who are always looking for ideas on how to deliver an enhanced shopper experience. Scent stimulation related to targeted products is one way to go. ...