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Show SCIENCE SKETCHES ffl) BEETLES are the largest of all insect I y, groups, reports the Chicago Natural 1 l 4-KTf A History Museum, ranging in size fT" V J " ' ' 'rom e t,nY feQtherwing to the 1 r "v") Goliath, a giant African insect as II J I KSoj V large as a mouse. It would take 23 lJ lull I i 1 y million featherwings to equal the LT-vi is -3 ' we'9'1 f a single Goliath. fl Hi m S0ME GASES are drier thtm others- vj; H Ws--'' B Carbon dioxide used to shield arc I y welding must be very dry (-40F. dewpoint) to avoid spattering of hot LIQUID SUGAR may be head- metal, reports Cardox. Because it is ing for the nation's store nearly inert, CO2 prevents molten shelves. Recent consumer metal from combining with impuri- testing indicates that accept- ties in the air that could cause the ance is a sure thing. hardened weld to be below standard. |