Two Identical Springs in Parallel: Why Stiffer?

[physics20]

If there are two identical springs with same length and spring constant, why would the combination of the two springs in parallel be stiffer (that is have a greater spring constant) than the springs alone?

 

[bp_psy]

Try to think what force you would have to apply to compress both springs some distance and what force you would have to apply to compress just one of them the same distance.