We asked our regular contributors through e-mail What’s the best-kept secret on the Internet? We got many interesting responses. Here are some of them. We have just copied and pasted their responses, not editing them in any way.

1. MOOC’s (Massive Open Online Course). College courses from universities everywhere that are free to enroll and participate online.
– eternalrefuge86
2. That one obscure piece of research you found earlier but forgot to save.
– PapaHerbert
3. This website, slugbooks.com I think, has free or extremely cheap digital college textbooks.
– StellaChar
4. The identity of the creator or creators of the Cicada 3301 puzzles.
– TurtleKing0505
5. The Wayback Machine and how you can recover deleted news articles, posts, and other otherwise unreachable pages.
It’s the reason nothing on the internet is truly ever deleted.
– DubioTheDubious
6. Save10, save20, and save 30 are premier discount codes on a surprising amount of websites. Anytime on a check out just try one of these and 25% of the time one of them works.
– iforgottheothercode
7. Don’t buy anything straight away. Leave it in your cart for a week (as long as you’ve got as far as putting in an email address).
– greyjackal
8. How karma is calculated.
– mmicahj
9. A certain service station/fuel company in Australia has a phone app that lets you lock in the price of fuel at your closest fuel station for a week. People have ‘found various ways’ to lock in the price of fuel at any of their stores in Australia (against the TOS), giving you huge discounts if your local fuel servos are expensive/at the top of the cycle. Eg. If the fuel in Brisbane is $1.70 and it’s $1.20 in Melbourne. You’d pay as if you’re in Melbourne, saving you 50c/L.
– spatchi14
10. I love radiooooo.com you can listen to music from around the world in different decades at the click of a button. I found a lot of great music from it. If you’re into world music, definitely check it out.
– bob_boo_lala