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.
LONG-TERM COFFEE DRINKING MAY PRODUCE A TOXIC LIVER. Because of the overload on the liver to detoxify chemical residues, long-term coffee drinkers often have a toxic, congested liver and impure blood. The function of the liver is to filter the blood so the blood can nourish the cells.