This year, one of those resources, the Scottish Sensory Centre’s British Sign Language Glossary Project, added 116 new signs for physics and engineering terms, including signs for “light-year,” (hold one hand up and spread the fingers downward for “light,” then bring both hands together in front of your chest and slowly move them apart for “year”), “mass” and “X-ray” (form an X with your index fingers, then, with the index finger on the right hand, point outward).