** How to demonstrate without being an x **

Introduction
Public summary: 

Often you may have to demonstrate an experiment with which you have no knowledge about, there are lots of ways to use the experiments to talk about science and experiments without being competent at the subject.

Demonstrating without knowing
Useful information
Kit List: 

Most experiments work well but these are good:
Slug Bubbles
Animal Skulls
Most engineering
Hand Models

Explanation
Explanation: 

So you've been asked to demonstrate something to balance out subjects, cover someone's lunch or fancy a change. Even if you don't know anything about the experiment there's still ways to make it a fun demo.

One of the main things you can talk about is the hypothesis and testing of that hypothesis. Ask them what they think will happen and be prepared to provoke and play devil's advocate. Especially if you start with simple things they'll be able to give you evidence to support.
E. G. Slug Bubbles what will happen to the untopped tube of water when the bottom is removed. It'll fall due to gravity, like other things they've seen fall.
With lots of physics and chemistry experiments this is a great option. For biology you could get them to think about the hypothesis of why this shape is useful (e.g. teeth in animal skulls), there are often lots of reasons why so everyone can be right.
Try and get discussion flowing and a balance of opinions, emphasis how we can decide which hypothesis is correct and try and test this. You can also talk about cases when it is impossible to test via experiment as it's really difficult. If you test try and reconcile people's intuitions what went off, perhaps the factor they talked about isn't as significant, physically you could talk about things having quadratic and cubic and dominating in large limits. Biologically if you're talking about uses then you might have to talk about features compromised between two uses and evolution.
What ways can we have other than experiments to determine something? dissection, theoretical models, equations, computer simulations. You could think of some examples, what might be the pros and cons of doing these.
If you have an experiment where it's easy to vary things and test them get them to do this, or come up with ideas of what to test and how.

Risk Assessment
Risk Assessment: 

One may decide to change subject
Talk to DoS

Members of public may ask complicated questions you don't know the answer too
Admit you don't know, pick on someone you don't like, say they're an expert and send person to them

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