Calibration is one of the most critical steps in the pH measurement process. Some of the common calibration-related problems include out-of-range slope values and cell constants, inaccurate readings ...

The U.S. probe that collected a sample from an asteroid earlier this week retrieved so much material that a rock is wedged the container door, allowing rocks to spill back out into space, NASA ...

When explosions ripped through a Philadelphia oil refinery last year, the shock waves knocked Felicia Menna’s front door frame out of place. Then came the black smoke.