The paper by Cronenwett, Oosterkamp, and Kouwenhoven demonstrates the tunable Kondo effect in small quantum dots. They show that the Kondo effect can be switched on and off by changing the number of electrons on the dot from odd to even. The Kondo temperature can be tuned using a gate voltage as a single-particle energy state nears the Fermi energy. Measurements of the temperature and magnetic field dependence of a Coulomb-blockaded dot show good agreement with predictions of both equilibrium and non-equilibrium Kondo effects. The authors use a simple model to describe the Kondo effect in quantum dots, where the number of electrons is well-defined and the charge is quantized. They report extensive measurements of the Kondo effect in two quantum dots, showing that the Kondo peak in the density-of-states (DOS) splits into two peaks when a bias voltage is applied. The Kondo temperature can be tuned by moving the energy state ε0 towards the Fermi energy, and the Kondo peak in the DOS at zero bias is observed to split into two peaks in a magnetic field. The results provide strong evidence for the Kondo effect in quantum dots and highlight the tunability of the Kondo temperature.The paper by Cronenwett, Oosterkamp, and Kouwenhoven demonstrates the tunable Kondo effect in small quantum dots. They show that the Kondo effect can be switched on and off by changing the number of electrons on the dot from odd to even. The Kondo temperature can be tuned using a gate voltage as a single-particle energy state nears the Fermi energy. Measurements of the temperature and magnetic field dependence of a Coulomb-blockaded dot show good agreement with predictions of both equilibrium and non-equilibrium Kondo effects. The authors use a simple model to describe the Kondo effect in quantum dots, where the number of electrons is well-defined and the charge is quantized. They report extensive measurements of the Kondo effect in two quantum dots, showing that the Kondo peak in the density-of-states (DOS) splits into two peaks when a bias voltage is applied. The Kondo temperature can be tuned by moving the energy state ε0 towards the Fermi energy, and the Kondo peak in the DOS at zero bias is observed to split into two peaks in a magnetic field. The results provide strong evidence for the Kondo effect in quantum dots and highlight the tunability of the Kondo temperature.