In the Netherlands, we have a saying which was once a TV commercial for a toilet bowl cleaner. It goes like this: We from WC-duck recommend WC-duck. WC-eend (WC-duck) is a toilet bowl cleaner where the neck of the plastic bottle is shaped like a duck’s neck to easily spray the cleaner under the rim. Here is the Wikipedia entry – including a picture of the product – which you can go yo and translate into English by right-clicking anywhere in the entry and choosing translation.
A Hechinger Report review found dozens of education software companies promoting their products with little or shoddy evidence to support their claims.
You might also want to read the blog that Mirjam Neelen and I wrote about edupreneurs.