  The International Young Physicists' Tournament (IYPT) continued in 2018 in
Beijing, China and 2019 in Warsaw, Poland with its 31\ts{st} and 32\ts{nd}
editions. IYPT is a modern scientific competition for teams of high school
students, also known as the Physics World Cup. It involves long time
theoretical and experimental work focused on solving 17 publicly announced open
ended problems in a teams of five. On top of that, teams have to present their
solutions in front of other teams and scientific jury and get opposed and
reviewed by their peers. Here we present a brief information about the
competition with a specific focus on one of the IYPT 2018 tasks - the Ring
Oiler. This seemingly simple mechanical problem appeared to be of such a
complexity that even the dozens of participating teams and jurying scientists
were not able to solve all of its subtleties.
