I really like the mathematical concept of dimensions. 1D, 2D and 3D are fairly easy to understand but when a 4th dimension is introduced it gets a bit tricker to visualise, it’s explained quite well here with some good pictures of a Teseract which is a 4D cube (as well as being the container for the Space Stone if you’ve watched any of the Marvel films): https://en.wikipedia.org/wiki/Four-dimensional_space
I like to think of the fourth dimension as time, mainly because ‘biological time’ is at the core of what we’re trying to understand in the lab. Sadly, it’s also often neglected in experiments and in medicine – the point is, the time of day at which you do your experiment may dictate the results you get, the time of day you measure a parameter in a patient may change your interpretation of their clinical status, and the time of day you give a treatment may determine how effective it is. Throws up a lot of questions that need answers!
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