The possibility of reversing this exponential attenuation was first suggested in 2004 by Tada and Yoshizawa, who predicted increasing conductance with length in specific molecular systems. Subsequent studies proposed various molecular wires exhibiting this behavior without invoking bond-length alternation (BLA). The connection between BLA and conductance increasing emerged later as a theoretical curiosity, before being formally investigated in specific molecular systems. Another key insight was that diradical character, rather than BLA alone, can also facilitate this conductance increase, as demonstrated in subsequent theoretical studies exploring various molecular candidates. However, no molecules that fulfill this condition had been found until Garner et al. demonstrated, using DFT and NEGF calculations, that cumulenes-linear chains of sphybridized carbons with successive double bonds-exhibit reverse BLA, increasing electronic transmission with length (Figure ). Their computational analysis showed that the dominant π-system has a reversed bondlength pattern for even-carbon cumulenes compared to polyynes or conjugated alkenes, resulting in a negative decay constant and meaning that conductance increases with length.