Figuring out who is telling the truth and who is
lying had never been an easy task. And hardly will ever be. Especially
if the conclusion should be done based on the statements from the
persons being investigated.
Ten bugs are arranged into
two rows of five bugs each. Move just four of them so that
five rows of four bugs appear. No option of two bugs at one
spot though a bug can be simultaneously a part of several
The challenge posed by Lewis Carroll to a
teen-age girl in 1873 about how to reduce the area of a window in half
but at the same time keeping its height and width intact. Is the
problem still actual nowadays?
Suppose you have an immense supply of wooden
cubes and several paint tins each containing a different color of
paint. How many differently painted cubes would you be able to produce
with such a toolkit?