[geekguy (OP)]

I want to buy a science-related gift for my relative. He is one of the science nerds he likes science material. Can anyone suggest to me which gift should I buy to impress him?

[chiralSPO]

I would imagine the hive mind could help on this, but we will be more effective if you can first answer these questions:
What's your price range, how fast do you need it, and do you know what this relative likes more specifically than "science"?

[alancalverd]

How old?

Native language?

Practical or theoretical interest?

[Bill S]

The important thing it that it should be something he wants.  The best ideas could come from him.  With some care, and a range of ideas, you could still surprise him, if that's what you want to do.

[mrsmith2211]

Stephan  Hawking book might be fun, I received recently Brief answers to big questions

[Faltuh]

Stephan  Hawking book might be fun, I received recently Brief answers to big questions

I agree with you

[chris]

An oldie but a goldie, one of my favourite popular science books of all time is "Right Hand, Left Hand" by Chris McManus. A brilliant book and a worthy winner of both the Wellcome and Aventis book prizes.