Just some guy questions

• Singleton vs public static final variable
• Google ReCAPTCHA callback function not working
• Tkinter canvas flickering
• When is a treap useful?
• Binary heaps vs d-ary heaps
• JavaFX - Clickable line on canvas
• Java - Synchronized methods causes program to slow down massively
• Automatically updating date column on edit in phpMyAdmin
• JavaFX - Adapt TableView height to number of rows
• Why is statistics.mean() so slow?

Just some guy answers