Isaac Hartz, 4, plays on a toy keyboard at his Lawrence home. Toys with decibel levels over 100 dB include the VTech Touch & Teach Turtle. The Little Tikes Poptones Big Rockers Keyboard. They’re loud ...

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Have trouble sleeping, or getting to sleep in the first place? You’ve no doubt heard of white noise machines, but know it would be much cooler to make your own. Enter Noise Maker, a DIY sound ...

In some workplaces, at some construction sites, there are various machines doing all kinds of things. The issue is taken up in the following Kohler Power Systems presentation (Figure 1) at pages 18 ...