Recorded in Mexico City, Mexico, this video shows Manuel Vallarí recording a ping pong ball as it bounces ... the filmer introduces a set of obstacles (tied to the ceiling) that swing back ...

"Where would the scale tip? On the left is a steel ball, on the right a ping-pong ball," Reddit user Veiy wrote, posing the conundrum. "I think the scale would raise to the right since the [buoyancy] ...

The era of Ping-Pong diplomacy had begun 12 months earlier when the American team—in Nagoya, Japan, for the World Table Tennis Championship—got a surprise invitation from their Chinese ...