Physics is the search for and application of rules that can help us understand and predict the world around us. Central to physics are ideas such as energy, mass, particles and waves. Physics ...

Reprinted paper, unmarked save for "A" and "B" with arrows marked in pencil on the page of Plates facing p. 674. R D B Fraser, "The structure of deoxyribose nucleic acid" (typescript, dated 17 March, ...

Plants are very important living things. They have lots of jobs, such as providing animals with food and releasing oxygen into the air. To survive and carry out these jobs, they all need three ...