There is one modern museum in Nizhny Novgorod, in which you can not only view the exhibits, but also touch and participate in experiments. The museum is called "Quarks" and talks about physics. Each exhibit can be touched by experience. The museum is divided into 3 parts, each of which is inventions and opening a certain time. Epoch of inventions da Vinci, Michelangelo and earlier scientists, then the history of physics until 1918 and the third hall is devoted to modern physics. You can draw on the water, in the sand, you can touch zipper. Everything is described in detail, and if it is not clear, the responsive staff will show everything and will explain.
There are so many interesting installations, rooms. For example, the inclined room, where a complete disorientation occurs in a person. The brain says that you stand straight, but the eyes refuse to believe and some begins to spin the head. Or the room in which you need to look through the hole and when you look, then a visual illusion arises. People and it turns it into giants in Liliputs. There are other optical and sound illusions and paradoxes.
Very interesting museum for any age. The ticket is worth 300 rubles on weekdays, and on weekends 380 rubles. Very interesting to visit the museum. The price includes a free excursion. The ticket itself is valid all day. That is, you can leave the museum (the controller will put the bracelet to you), and then after a couple of three hours to return. Photographing is free and mandatory. From the positive points: all over the hall are sofas for recreation, and next to them machines with coffee and baking. Also, the presence of toilets is also a plus.
I advise you to visit everyone, you will not regret.