Now, in a recent study, researchers from Japan found a simple and low-cost way of tuning the reflectance spectra of pencil lead samples using plasma. Their technique enabled them to produce pencil ...

No.2 pencils are widely used, but you may not know what the number actually refers to. This video explains how pencils developed into their modern form and the significance of the labeled numbers.

The city's request, sent to the Centers for Disease Control and Prevention, was denied "due to the complete loss of (CDC's) ...