A method to release hydrogen from a material comprising hydrogen fixed fullerenes involves irradiating the hydrogen fixed fullerenes with electromagnetic radiation of sufficient intensity to release hydrogen rapidly upon irradiation. A power amplifier according to an aspect of the invention may include an amplification section amplifying an input signal according to a bias voltage being supplied; and a bias supply section comparing a level of the input signal with a look-up table set in advance and supplying a bias voltage to the amplification section according to a result of the comparison. Further, the external drive assembly includes an adjustable idler engagingly connected to the external drive belt wherein the impeller pulley and the multibelt pulley engage with the at least one rib of the external drive belt. , generated from historical logs. Island-like semiconductor films included in each of the plurality of TFTs are formed between the plurality of projective portions and also, are crystallized by a laser light scanned in a longitudinal direction of the projective portions. An information processing device receives sound as input and performs speech recognition.