An aldosterone test measures the level of aldosterone (a hormone made by the adrenal glands), in the blood. Aldosterone helps regulate sodium and potassium levels in the body. This helps control blood pressure and the balance of fluids and electrolytes in the blood. The kidney hormone renin normally stimulates the adrenal glands to release aldosterone.
A seahorse* can have from 100-1500 babies. Averagly 100-200 for most species, but may be as low as 5 for the smaller species, or as high as 1,500. Seahorses can have up to 1500 fry at one time, depending on the species. They are tiny and difficult to raise in captivity.
A California woman gave birth to eight babies Monday. This is only the second time recorded in the U.S. that a woman has given birth to live octuplets. Alex Cohen talks with Slate.com's Christopher Beam about how many babies can fit inside a pregnant woman. You can also read his Explainer column on the matter here.