Engineering Activities

Discover Engineering has some awesome engineering activities (how do you keep a plant nicely watered for a week while you're on vacation? Can you build a tunnel through sand without touching it?

http://www.eweek.org/EngineersWeek/DiscoverE.aspx?ContentID=90

There are even more, including full curricular units, here:
http://www.teachengineering.org/

Media-rich history of railroads and steam trains

http://www.makingthemodernworld.org.uk/stories/the_age_of_the_engineer/01.ST.04/?scene=1

Fun science experiments to do at home

http://www.sciencemuseum.org.uk/educators/classroom_and_homework_resources/resources/~/media/EC513F6B0F28453C8EBF70D6557A2042.ashx

This is a fun booklet of science experiments produced by a science museum in the UK.

Parts of a Computer

http://www.kids-online.net/learn/clickjr/clickjr.html

Free Computer Science Classes

http://www.udacity.com/