What classifies as a Biotube channel?

This has been a topic of debate between me and my brother: What is the biggest Biotube channel? This raises the question of what constitutes a Biotube channel. Does the channel only have to have constraction-related videos? Is it only supposed to have LEGO videos, or can it do other things too? What classifies as a Biotube channel? And what do you think is the biggest Biotube channel on Youtube?

Discuss!

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6 posts were merged into an existing topic: Best of Biotube