##  Philosophy                                                                   
- [Plato's Theory of forms](https://en.wikipedia.org/wiki/Theory_of_forms)
- [Platonism in the Philosophy of Mathematics](https://plato.stanford.edu/entries/platonism-mathematics/)
- [Münchhausen trilemma](https://en.wikipedia.org/wiki/Münchhausen_trilemma)     
                                                                                
## Chemistry                                                                     
- [Caffeine](https://en.wikipedia.org/wiki/Caffeine)                             
                                                                                
##  Miscellaneous                                                                
- [Art of Memory](https://artofmemory.com/)                                      
- [NISA (Nippon Individual Savings Account)](https://www.jsda.or.jp/en/activities/research-studies/files/NISA.pdf)
- [Crop rotation](https://en.wikipedia.org/wiki/Crop_rotation)                   
- [Mains electricity by country](https://en.wikipedia.org/wiki/Mains_electricity_by_country)
- [Hiking Time Calculator](https://trailsnh.com/tools/hiking-time-calculator.php)
- [Greenwich Time Signal](https://en.wikipedia.org/wiki/Greenwich_Time_Signal)   
- [List of Latin phrases](https://en.wikipedia.org/wiki/List_of_Latin_phrases)   
- [Casting out nines](https://en.wikipedia.org/wiki/Casting_out_nines)           
- [Luhn algorithm](https://en.wikipedia.org/wiki/Luhn_algorithm)                 
                                                                                
#### Day of week calculation                                                     
- [Calculating day of week](https://artofmemory.com/blog/how-to-calculate-the-day-of-the-week/)
- [Notable dates in history](https://www.quia.com/jg/102097list.html)            
- [Day of week calculator](https://www.calculator.net/day-of-the-week-calculator.html)