How is a fly different from a mosquito?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

What happened when the wheel was invented?

Forwards I am heavy, backward I am not. What am I?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?