New answers tagged joints
If you're joining two pieces of wood along the length of the grain, the glue bond can be stronger than the wood itself. Butt joints are the exact opposite. If you need to join two grain ends, you'll want to reinforce it with biscuits or dowels (or possibly something even fancier like dovetails). Without knowing what you're attempting to make, my suggestion ...
The right way: buy a bigger piece of wood. For very limited, low-stress uses, the biscuit joiner as mentioned by @Nathan might work well enough - as might a Tongue and groove joint, double-groove and spline joint, or lap joint. While a scarf joint (various types are available) is strong, with such short pieces of wood you probably don't have enough wood in ...
Use a biscuit joiner. Then glue and clamp to dry. But depends what you using them for. There not going to be heaps strong if the timber spands over a distance.
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