<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=utf-8"> <META content="MSHTML 6.00.6002.18538" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Hi, </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>did anyone try to repeat Ch. Stoll sound wave measurement <A href="http://www.ted.com/talks/lang/en/clifford_stoll_on_everything.html">http://www.ted.com/talks/lang/en/clifford_stoll_on_everything.html</A> (starts around 10.30) on Sugar/Measure Activity?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I could not introduce second beam - all sounds merged in one. Any hints / ideas?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Thanks</FONT></DIV> <DIV><FONT face=Arial size=2>DG</FONT></DIV></BODY></HTML>