Why no adverts?

We have recently updated the site and removed adverts. We feel adds can be off-putting in a blog like this, get in the way of content and may suggesting conflicts of interest. If you like Photonic Positive, please instead show your appreciation by making a simple donation to us using paypal at  www.paypal.me/SJFrost  This will provide us with some feedback and is the only income to cover our admin costs, maintain our independence and so will help a lot.