What is so fragile that saying its name breaks it?

How can you take 2 from 5 and leave 4?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

What does the below rebus riddle means?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?