A food scientist in Holland has created a burger grown in a laboratory.
Tens of billions of cells of beef muscle-tissue need to be grown to put together the quarter-pounder.
Experts are worried that as the world's population grows, it will be harder to produce enough for everyone to eat.
It's thought that growing meat in labs may be kinder to the environment, reduce animal suffering, and could help to solve problems like famines.
The meat is grown from just a few animal cells, so animals don't need to be killed, or fed for years.
The man behind the burger, Dr Mark Post, says meat grown in a lab should be as safe as - or even safer than - normal meat, and it may actually be healthier because it contains less fat.
The burger will be cooked and eaten at an event in London in a few weeks' time.
But it may be a while before you can get your hands on a lab-grown burger to try it for yourself; Dr Post's burger cost more than £200,000 to make.