It’s time for April’s Science Writer Tip-Jar picks. For those new to this, here’s the low-down:

Throughout the blogosphere, people produce fantastic writing for free. That’s great, but I believe that good writers should get paid for good work. To set an example, I choose ten pieces every month that were written for free and I donate £3 to the author. There are no formal criteria other than I found them unusually interesting, enjoyable and/or important.

So without further ado, and in no particular order, here are the picks:

And for interest, the tip-jar initiative has raised US$350 over the last two months. Thanks to everyone who contributed.