A train with lasers is running on Metro-North's New Haven line once a day this fall.

Here’s a shower thought: if light and sound both travel as waves, can you make something that works similarly to a laser but uses sound instead of light? It turns out that the answer is “yes”! If you ...

It doesn’t make a “pew pew pew” sound, but a Metro-North Railroad train that uses laser technology to clean troublesome leaf residue off tracks has returned to Connecticut ...