Listen free for 30 days

One credit a month, good for any title to download and keep.
Unlimited listening to the Plus Catalogue - thousands of select Audible Originals, podcasts and audiobooks.
No commitment - cancel anytime.
£7.99/month after 30 days. Renews automatically. See here for eligibility.
523 Hard to Believe Facts cover art

523 Hard to Believe Facts

By: Nayden Kostov
Narrated by: David A. Conatser,Storyline Voice-Over
Try for £0.00

£7.99/month after 30 days. Renews automatically. See here for eligibility.

Buy Now for £13.79

Buy Now for £13.79

Pay using card ending in
By completing your purchase, you agree to Audible's Conditions of Use and authorise Audible to charge your designated card or any other card on file. Please see our Privacy Notice, Cookies Notice and Interest-based Ads Notice.


Which was the first country to give the citizenship to a robot? 

Is the dark side of the Moon always dark? 

What is the sismo detector? 

Discover the answers to these seemingly random questions and more!

The interesting trivia in this pause-resisting fact audiobook were collected by Nayden Kostov, founder of the RaiseYourBrain website and author of popular fact books such as 1123 Hard to Believe Facts, and 853 Hard to Believe Facts

As the third installment of this series, 523 Hard to Believe Facts has more detail for each fact, as requested by previous fans! These facts are a result of years of sifting through history and reference books, as well as searching the Internet and researching the news.

Each fact is suitable for nearly any age. The “spiciest” entries are separated and listed in their own chapter, but still use clean language!

Become a trivia whiz with even more facts in the Hard to Believe Facts series!

©2019 Nayden Kostov (P)2020 Nayden Kostov

What listeners say about 523 Hard to Believe Facts

Average customer ratings

Reviews - Please select the tabs below to change the source of reviews.

No Reviews are Available
Sort by:
Filter by:
  • Overall
    5 out of 5 stars
  • Performance
    5 out of 5 stars
  • Story
    5 out of 5 stars
Profile Image for Amazon Customer
  • Amazon Customer
  • 11-04-20

Hours of entertainment

I am a fan of the RaiseYourBrain concept. It offers tons of curious information for one's personal use and for sharing with others. The audible medium format is very well crafted and also adds to the fun.