BBC News
By Pallab Ghosh
image captionThe findings come from the US Muon g-2 experiment
From sticking a magnet on a fridge door to throwing a ball into a basketball hoop, the forces of physics are at play in every moment of our lives.
All of the forces we experience every day can be reduced to just four categories: gravity, electromagnetism, the strong force and the weak force.
Now, physicists say they have found possible signs of a fifth fundamental force of nature.
The findings come from research carried out at a laboratory near Chicago.
The four fundamental forces govern how all the objects and particles in the Universe interact with each other.
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