A single atom can gauge teensy electromagnetic forces
The unit of measure, a zeptonewton, is equal to one billionth of a trillionth of a newton
![illustration of a laser hitting a charged atom](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/03/032218_ec_zeptonewton_feat.jpg?fit=860%2C460&ssl=1)
FEEBLE FORCE Scientists detected a tiny force using a charged atom (illustrated as a red sphere), which moved (orange) when pelted with laser light (purple). A lens focused light emitted from the atom into a moving image (black arrow).
V. Blūms et al/Science Advances 2018