See the Kepler data release schedule. Exoplanet Archive Kepler Resources General Documentation . Kepler Extended Mission data philosophy; How to request a Kepler number; How to request a K2 number; Search for a Kepler light curve; K2 Mission page
Radium was discovered by Marie Sklodowska-Curie and her husband Pierre Curie on 21 December 1898, in a uraninite (pitchblende) sample. While studying the mineral earlier, the Curies removed uranium from it and found that the remaining material was still radioactive.
Marie Curie and The Atomic Theory. Ninety years later, Pierre and Marie Curie were to discover and isolate radium, a new element which spontaneously disintegrated into other elements. This proved that the atoms of one element at least were not indivisible.