In less than 100 seconds, Helen Heath explains why some particles have equal but opposite partners. Want to read more? Registration is free, quick and easy Note: The verification e-mail to complete your account registration should arrive immediately. However, in some cases it takes longer. Don't forget to check your spam folder. If you haven't received the e-mail in 24 hours, please contact customerservices@ioppublishing.org. E-mail Address
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Particles and interactions Research update Physicists confirm proton radius is smaller than we thought
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