For one half of my readers: Congratulations to the 88th anniversary of the Great October Revolution! Well, it was not great, it was not in October, and it was not a revolution but rather a coup, but nevertheless,
Well, no longer in Russia, but a celebration in Ho Chi Minh City in VietNam is fine, too. As kids, we could always watch some fireworks before November 7th. In the first approximation, one must be extremely grateful that this era is gone.
On the other hand, we live in a modern, environmentally friendly society, and therefore all the trash from the past is recycled in one form or another - which is why our expected happiness received negative contributions from the second order perturbation theory, much like in most cases in physics. :-)