Andrey Solovyev

Guess the missing word in 200 English proverbs and idioms:* Spell the missing word quizzes (easy and hard)* Multiple-choice quizzes (also easy and har …

Learn all 54 independent African countries, including South Sudan: from Morocco to Côte d'Ivoire.* All flags* All capitals* All maps* African Chal …

Do you know how the Mexican flag looks like? Do you remember the order of colors on the Irish flag? This app will refresh your memory of national flag …

If you know all European countries, you can test yourself. If you don't know flags and capitals of European countries, or where they are situated …

You'll learn the names and symbols of all 118 chemical elements of the Periodic Table with this app - from hydrogen and helium to plutonium and li …

Steroids are an important class of natural products with various biological functions: steroidal hormones (estradiol, testosterone), vitamins (vitamin …

Carboxylic acids and esters are one of the most important classes of organic compounds. They are everywhere:* in food (citric acid; vinegar = a soluti …

Learn all 12 Provinces of the Netherlands (from Friesland to Zeeland) and 3 Public bodies in the Caribbean Netherlands (Bonaire, Sint Eustatius, and S …

For all opera fans! Demonstrate your knowledge of the 50 most performed operas by the most important opera composers. The app has 3 game modes: * gues …

This is an excellent app for tourists planning a Caribbean vacation, for students taking a geography class, and for those people who want to remember …