Scientists to invent time machine in near future

So says an Onion-like yet perfectly serious Pravda headline dated November 1. OTOH, if the article is correct, dates are irrelevant. The prediction is hard to disprove. According to the article, (a) time travel is possible only into the future, (b) outside observers won't be able to detect a time traveller, and (c) cause and effect relationships apply both forward and backward in time, making it impossible to change anything.