Alex012020 best comments

+9 3d printing ABS frame for TT pistol. + homemade cartridges
+1 China completes testing technology for detecting gravitational waves in space
+1 NIST researchers have proposed a technique for direct gravitational observation of dark matter particles
+1 3d printing USA
+1 3d printing USA
+1 3d printing USA
+1 3d printing USA
+1 Moon in HDR
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