The NIST ytterbium-doped fiber laser used can provide up to 530 watts of laser output at a wavelength of 1.07 microns. At full power, they were able to deliver as much as 3.5 uN (0.35 mg) of force to the mirror. The experiments showed the expected linear relation between measured force and laser output.
It's just the way coffee is. Coffee is acidic. That's what probably upsets your stomach, especially if you're not eating or drinking other fluids throughout the day. People say that using coffee grounds are excellent for growing plants. BUT, they are only good for growing plants that are acidic soil loving plants.
Drinking five 8-ounce servings of tea per day is equivalent to drinking three 8-ounce servings of coffee, which has about 250 milligrams of caffeine, and is considered moderate caffeine consumption, according to MedlinePlus. Excessive caffeine consumption may cause upset stomach, nervousness and other side effects.