Lets see the proof

[brian334]

I say only something that has mass can make something move, gravity makes things move, therefore gravity must have mass.

[the_big_m_in_ok]

I say only something that has mass can make something move, gravity makes things move, therefore gravity must have mass.

does that also go for electromagnetism?

the shift key doesn't work on all the time on this keyboard;only occasionally.  I'll report it to the library staff.

Later re-edit on a different computer(that does have a working 'Shift' key):
Gravity attracts everything with mass, doesn't it?  Magnetism and electromagnetism only attract or repel those things that are themselves magnetic.  That answers half of my question above.  Magnetism acts like gravity only in specific instances.


--lee

[onthecuttingedge2005]

I say only something that has mass can make something move, gravity makes things move, therefore gravity must have mass.

May I suggest MIT, it really is a very good place to study.

Cheeri'O
Jerry