How do you make wood stronger, just by buring it?
490830
I think you mean burning?? as in carbonising, you partly convert the tip of a wooden arrow or spear to charcoal, this carbon is harder than the wood., too much and it shatters.
139126
It can only hold the weight of 16 pennies.  He-He.  Just kidding.  Actually, that's a good question.  I've been a carpenter all my life and to tell you the truth, a 16d nail is one damn strong piece of metal.  Ever pull one out of a piece of lumber that was shot in with an air gun?  It'll make you grunt, that's for sure!  One that's galvanized is even more difficult.  And if it's a ring-shanked nail?  Forget it.  It's in the lumber until the wood rots.  It's really not a matter of how many pounds it can hold.  It's a matter of its bonding power.  You can bend a 16d nail quite easily, but after it penetrates into a 2 x 4, for example, it's meant to stay, depending on how it was put to use "structurally".
82967
Pipe makers use briar wood!\nIt is very hard and very hard to get!
223052
Use a dull axe. This will transfer more energy, in line with the grain of the wood. The laminar arrangement of atoms in the wood gives the tree strength that can withstand major blows at right angles to the grain. A sharp axe will part the grain, and alow the blade to penetrate. You don't want that. You want to force a sliver of wood to move along the grain. A splitting axe has a dull blade on one side, and a flat head on the other. Use the flat head to pound wedges. Wedges are useful, when dealing with knotts. Knotts disrupt the laminar structure, making it hard for axe to force sliver in one direction.
1147590
use some nail hardner
1039071
Wood is a good start.
549468
Add some baking soda first and then pour on some vinegar. You will observe some bubble forming and the bublbles will rise very quickly. If you want to make fire instead, add some glycerine to potassium permagnate. Be very careful if you want to do this.
1037651
Needle and Thread work wonders.\n\n\n\ndp
966317
You can do something simple like:\nWhich glue is stronger?\nwhich mouthwash kills more germs?\nwhich detergent removes stains the best?\nwhich paper towel is the strongest?\n\nhttp://www.scienceproject.com/projects/index/intermed.asp\n\nyou can use this website for ideas
416914
Try to make it at 3 feet.  It will probably be easier.  I'd probably use balsa wood.
37625
I used superglue to build a minature bridge out of toothpick for a class.  It weighed the least amout of all the bridges in the class and it held the brick (which was the assignment).  If you don't care about the weight other glues will work, but the will absorb into the wood more and make your bridge heavier.  Also, work on an old surface that it is okay to get glue on.  I had to use a razor blade to get it off my desk.  Using my desk helped make it straighter and stronger.  Good luck.
603739
Try http://en.wikipedia.org/wiki/Woodworking
467048
Buy rope and 4 wooden poles. Use 2 mattreses underneath.
433327
If you have m*rning wood!
586570
Stick the toothpicks together in a kind of lattice-work.  Making series of triangles, and then assembling the triangles into a larger structure will give you the greatest strength/weight ratio.
427779
Slow it down.\n\nIf you mean 'break' then you will have a job as it is a solid lump of steel - you can break the shaft fairly easy though (personal experience).\n\n\nEnjoy
1013750
There are ways to make wooden boards easier to break that are used to ensure that all get broken.  Putting them in the oven with a low temp to dry them out will make it easier but there is not much that can be done with concrete except using low quality concrete.  I have broken concrete with my hands twice and it is easy with confidence but it does hurt, you feel it when you are done.  Wood boards hurt too if you do it wrong and it is simply to check that you are using proper technique when striking.\n\nWhen striking many at a time, when you break the first and use your weight to keep the momentum of the strike going, the blocks help to break each other by their placement and by the technique which you are striking with.