When it's bad luck to meet a black cat?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Thomas has missed an excessive number of days of school, so he must meet with Principal Davis. Mr. Davis asks him "Why on Earth have you missed so many days?" Thomas replies "There just isn't enough time for school. I need 8 hours of sleep a day, which adds up to about 122 days a year. Weekends off is 104 days a year. Summer vacation is about 60 days. If I spend about an hour on each meal, that's 3 hours a day or 45 days a year. I need at least 2 hours of exercise and relaxation time each day to stay physically and mentally fit, adding another 30 days. Add all of that up and you get about 361 days. That only leaves 4 days for school." The principal knows Thomas is full of it, but can't figure out why. Where is Thomas going wrong?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

Solve the riddle below:

If a Chicken says, 'All chickens are liars" is the chicken telling the truth?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

The centre of the third figure is empty. What digit should fit inside?