CALCIUM carbonate can exist in three polymorphic forms, which in the order of their usual stabilities are calcite, aragonite and vaterite. Calcite is the most stable and the least soluble ...

The two main forms of calcium supplements are calcium carbonate (calcite) and calcium citrate (Citracal). There are other forms of calcium used in supplements, such as calcium gluconate and calcium ...

Riad Sattouf’s saga of his parents’ failed bicultural marriage, with its harsh depiction of life in rural Syria, has become a literary sensation. By Richard Fausset Richard Fausset reported ...

Advertisement They are also cartoons. There’s Daniil Medvedev, last year’s finalist, whaling his racket into the net. There’s Madison Keys, this year’s semifinalist, running down a ball ...