Festival to scare away winter

In many cultures the traditional ritual of scaring away the winter is still practised, although today the performance is mainly just tourist attraction.

The rock cycle

Due to the effect of both exogenic and endogenic forces, rocks constantly change. This is called the rock cycle.

Long-tailed mayfly

Mayflies or shadflies are insects whose larval stage usually lasts 1-3 years, which they spend in freshwater.

Reflecting a line segment across an axis

Axis t and line segment AB are given on a plane. Let’s plot the mirror image of line segment AB across t.

Sarcophagus

The recording shows a more than 2000-year-old gilded sarcophagus. You can see the names of the deceased and his protecting gods on the coffin.

35mm cinema projector

Watch this video to learn how a cinema projector works and how a film appears on the screen.

Reflecting a circle across an axis

Axis t and a circle with centre O and radius r are given on a particular plane. Let’s plot the mirror image of the circle.

How airbags work

A compound called sodium azide is responsible for the operation of airbags.

The hot ice experiment

The words hot and ice together? There must be a trick somewhere. Let’s have a look.

Plotting a perpendicular to a line at a given point P on the line

Both line e and point P, which is situated on it, are given. Let’s plot line g to include point P on line e so that it is perpendicular to line e.

Plotting a perpendicular on a line from a point P that is not on the line

Both line e and point P, which is not situated on line e, are given. Let’s plot line g such that it passes through point P and is perpendicular to line e.

Archimedes' seesaw

In this experiment, we use buoyancy to study the balance of two glasses of water.

Plotting parallel lines – Solution I

Let’s plot line g such that it is parallel to line e and passes through point P.

Plotting parallel lines – Solution II

Let’s construct a rhombus such that one of its sides lies on line e and point P is one of the vertices on the opposite side.

Archimedes’ principle with gases

Is there a difference between the weight of a plastic bottle filled with air and the weight of a crushed one?

Development of the carnation flower

The carnation is considered as the national flower of Spain. Let's see how the flower develops.

Constructing the perpendicular bisector of a line segment

Let’s construct the perpendicular bisector of a 6-cm-long line segment.

Plotting an angle bisector

In this video, we plot the angle bisector of a given alpha angle.

The focus of a jar

Studying the focal point of a jar filled with water.

How to copy an angle

Let’s copy a given alpha convex angle onto ray f with starting point F.

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