Questions asking for information about a known LEGO element/brick. Use the [Identification] tag for questions about unknown pieces or sets.

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Why are some of the supports on bottom of a lego piece hollow, and other are solid?

I've added an image of me holding two 1x3 bricks, one has solid supports (not sure the technical name...) and the other has hollow supports. Does anyone know the reason why they are different? Other ...
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What do factory markings on the inside of DUPLO pieces mean?

In addition to LEGO and DUPLO names embossed inside the pieces of early DUPLO figures, there are a variety of number formats (one to three digits, some hyphenated) and in the case of 1977, the year. ...
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What's the exact opacity and translucency of transparent bricks?

As answered in this question, transparent bricks are made of PC (polycarbonate) and as listed in this answer and on Brickipedia there are fourteen transparent colors: 40 Transparent (clear) 41 ...
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Substitutions for vintage hinges

I've recently gotten back into lego and I'm trying to restore old space sets (late 80's era) by buying parts on Bricklink. I've noticed that some of the hinge pieces are extremely expensive (e.g. ...