Chris Hadfield Brushes his Teeth in Space

Tekni (ph) from Beeton, Ontario asks: Is it challenging to brush your teeth in space without getting toothpaste up your nose from weightlessness? Well, let’s talk about how to brush your teeth in space. Standard toothbrush, nothing magical there. But we’ve got a few different things. We don’t have running water. You can’t have a […]

Nondetects and Data Analysis

Let’s start with terminology, non-detects are real data. What bothers me all the time is when someone talks about non-detects and then the real data. And non-detects are real data. We’ll see how to use them today. Sometimes they’re called Less-thans, because they’re at the low end of the distribution of data, called Qualified Data. […]

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