BBC Science Focus Magazine

Dr Emma Davies

Dr Emma Davies is a science writer and editor with a PhD in food chemistry from the University of Leeds. She writes about all aspects of chemistry, from food and the environment to toxicology and regulatory science.

Why do trees have such shallow root systems?

A tree's feeder roots are often found in the top 20-30cm of the ground.

Why are eggs so useful in baking and what is aquafaba?

Aquafaba is made from the viscous leftover from cooking (or soaking) chickpeas, and it's a vegan substitute for eggs.

What is watermelon snow?

It's also known as blood snow, pink snow, or red snow.

Why does leftover pizza taste so good?

If you can't finish a whole takeaway pizza the night before, be sure to keep a couple of slices in the fridge for tomorrow.

Why does striped toothpaste always come out striped?

The answer does not lie with clever engineering, but with carefully designed pastes.

Is it true you can’t just cut the mouldy parts off food?

You may think you are carefully eating around the mould, but there are likely to be hidden toxins lurking below the surface.

Why doesn’t halloumi melt?

It's perfect for grilling on the barbeque.

Why is flash photography banned from most museums?

Is it a way of reducing damage to works of art or increasing sales in the museum gift shop? Chemistry expert Emma Davies sheds some light.

Is it healthier to eke out my Christmas chocolates, or eat them all in one massive binge?

Go on, treat yourself.

What are trovants?

Simple ways to avoid an afternoon slump, according to science

Why do I feel fine up to lunchtime, but as soon as I’ve finished eating, I’m suddenly ravenous?

What is freezer burn, and should you still eat the food?

Where should you store your eggs?

How much cheese is too much cheese?

What is the Maillard reaction?

How to prime your hunger hormones to avoid over-indulgence this Christmas

Is marmite good for you?

Should I take my shoes off inside the house?

How do you thicken a sauce?

Why are biscuits so addictive?

Does eating spicy food give me acid reflux?

Does blowing on a hot cup of tea actually cool it down?

How do tearless onions work?