Interesting weekend events

As always, on Monday, a short selection of what you could miss over the weekend.

About the benefits of callback for sites with low traffic.

The US education system: junior and high school .

1st part of the crowdfunding guide.
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Overview of systems of counting visitors (real).

Do startups need large corporations?

Programmers and depression .

Digital potentiometers - what's what.

News from the E3 game conference.

The Philae probe came in contact with the surface of the comet.

Kemerovo multipurpose helicopter in 2016.

“Izvestiya” on the possibilities of legalizing Bitcoin.

The 4th part of the sci-fi "Project" Eye "."