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. For example, gravity makes objects fall to the ground, and heavy objects behave as if they are glued to the floor. The UK’s Science and Technology Facilities Council (STFC) said the result “provides strong evidence for the existence of an undiscovered sub-atomic particle or new force”. But the results from the Muon g-2 experiment don’t add up to a conclusive discovery yet. There is currently a one in a 40,000 chance that the result could be a statistical fluke — equating to a statistical level of confidence described as 4.1 sigma.