Quantum mechanics/Casimir effect in one dimension. Abstract The Casimir effect is interesting because it introduces the concept of Ramanujan summation of the divergent series, 1+2+3+4+..., and because it offers experimental evidence that empty space is not truly empty. Every step in this derivation of the Casimir effect uses straight-forward and familiar mathematics.
Man's Kidney Failure Linked To Massive Tea Consumption. The puzzling case of a 56-year-old U.S. man who suddenly developed weakness, fatigue and body aches is leading doctors to warn that massive consumption of tea may be responsible.
Precautions and Warnings. Check with your doctor before eating tea leaves if you have a medical condition or you are taking any medications. Avoid tea leaves if you're pregnant or breast-feeding, or if you have high blood pressure, kidney or liver issues, or anxiety. Too much caffeine can cause side effects and even overdose.