k programming language
download  (then $chmod +x k)
examples

$k
 s:2            / atom/scalar
 v:2 3 4        / list/vector
 s+v
4 5 6
 m:(v;3 4 5)    / list/matrix
 +/m            / + over
5 7 9
 +/'m           / + over each
9 12
 v 1            / apply(index)
3

 d:[a:2;b:3]    / dict
 d`b            / apply(assoc)
3
 d+d
[a:4;b:6]

 f:{x+2}        / function
 f 1            / apply(call)
3
 f v
4 5 6
..

k is similar to clojure and python but does more with less, e.g. 
trillion row databases q4 and self-contained graphics edit.k
kx.com and some k-based companies: 1010data.com appian.com

kOS one system. all devices. from scratch.
kDB store anything. compute anything. fast.

iverson: turing award paper
perlis: lyrical programming