He’s made a real-time-clock module controlled by a rubidium frequency standard, and since it also includes a GPS clock he can track local time dilation effects by comparing the two. Surplus ...

Rubidium is an alkali metal in group IA of the periodic table with atomic number 37, an atomic weight of 85.47, and a density of 1.53 Mg/m 3. Its melting point is 38.9 C, and it boils at 688 C. The ...

Unfortunately, Robinson's results remain unpublished. As it turns out, rubidium is a member of a large 'family' of metals and other materials that tend to grow whiskers 5. In fact, tin ...