Ronaldo is a great professional. He truly cares about details. That's why he is always fit.

Padoin is proving himself to be a great professional. He's tactically intelligent, and it's tough to play in front of the defense.

Football is not an exact science, but it is about chemistry: Ronaldo and Mandzukic, when they are together, have an excellent understanding.

Any player over 40-50 games per season will have moments of fatigue, let alone a 22-year-old who has a lot to learn on how to control games and pace himself throughout 90 minutes.

When I was younger I just played football for the fun of it, scoring the maddest goals and trying to come up with new tricks but when you've got to take yourself into a proper match, you've got be serious.

In my Ph.D. thesis, written in 1989, I discussed the fact that when a civilization develops the technology to prevent catastrophic asteroid impacts, it marks a significant moment in the evolution of the planet.

Despite all the Internet has done to make prices transparent and bibliographic information universal, you can still find - at book sales and thrift shops, auctions and even fancy dealers - unrecognized or underpriced rarities. Getting something valuable for cheap is the basic, greedy thrill of book collecting.

In my first company, Seer Technologies, where I was chief technology officer, we shied away from the media. We watched every word and were guarded in front of journalists.