physics

  • The Physics of Tenet Is Shaky, but It Still Kicks Arse

    The Physics of Tenet Is Shaky, but It Still Kicks Arse

    “Don’t try to understand it,” a scientist tells the protagonist of Tenet, as she briefly explains the physics of Christopher Nolan’s $US205 ($271)-million, time-travelling spy thriller. Sure, the physics is often unrealistic and confusing, but it’s fascinating. And with its many Easter eggs, Tenet sets up some nice jumping-off points for Wikipedia rabbit holes. (Sator…


  • Why Does Gravity Exist?

    Why Does Gravity Exist?

    To understand this, we need to know what gravity is. Something seems to hold us down on the ground. It makes us hit the floor with a thump if we fall over, and makes your marbles roll down slopes. Have you ever jumped on a trampoline? When you are in the air your arms feel…