Mind benders

A great collection of hard Science fiction, which has some real mind benders. For example, I really liked The Slipway, but it was heavy in the physics of astronomy; not so much as to make it non-understandable, but a little difficult to follow what was being described ( )

Some of these stories were interesting, but I wasn't blown away by any of them to be honest. It's a good read either way though. ( )