A relative answer to the growth–saving puzzle

Answer to the Rhythm Puzzle

The ECG (electrocardiography) shows a sinus bradycardia of 42 beats/min, a horizontal electrical heart axis and a narrow QRS complex. The second to fourth QRS complex is preceded by a P wave with a variation in the PQ time. The PQ time in the second QRS complex is 220 ms, in the third 200 ms and the fourth 140 ms. No P wave precedes the fifth QRS complex. In the sixth QRS complex, the P wave is...

Puzzle - Answer

Scientific Puzzle - Answer

Bubble: Coronary air embolism: Iatrogenic introduction of air into the coronary vasculature results in coronary air embolism. It is an uncommon complication during cardiac catheterization with an incidence of 0.1–0.3%. Vascular air embolism increases microvascular permeability, and platelet aggregation occurs due to turbulent flow. The primary management of coronary air embolism is prevention. ...

Which is the correct answer to the Mpemba puzzle?

In my editorial in the last issue of Temperature, I included a riddle that was suggested to me by Gerald Pollack (University of Washington, Seattle, Washington, USA). Here is the original text of the riddle: "In 1963, Erasto Mpemba, a precocious middle school student in Tanganyika (now Tanzania) was taking a cooking course. The subject was: making ice cream. The participants would dump a premix...

The Unemployment Volatility Puzzle: Is Wage Stickiness the Answer?

I study the cyclical behavior of an equilibrium search model with endogenous job creation and destruction and extract from it a wage equation that can be compared with the econometric evidence. Job creation in the model is influenced by wages in new matches. I summarize microeconometric evidence on wages in new matches and show that the key model elasticities are consistent with the evidence. T...