Abstract: A helmet that is reliably and quickly removable from the head of a user by a third person includes a head covering shell having an insertion opening that opens downward and configured to protect the head of the user; a shock absorbing body disposed adjacent to an inner periphery of the head covering shell to reduce shock to the head of the user; and a cushion pad disposed adjacent to an inner periphery of the shock absorbing body to fill a gap between the shock absorbing body and the head. The cushion pad includes an emergency removal pad at a position along an opening edge of the insertion opening. The emergency removal pad includes a pad bag having a hollow interior, a pad body disposed in the pad bag, and a pad removal part that enables the pad body to be taken out from the pad bag attached to the opening edge of the insertion opening.

Abstract: Specific inorganic silica gels are used as an adsorbent drying agent for controlling insect pests in a structure. When it is too humid in the structure, the silica gels adsorb moisture. On the other hand, when it is too dry in the structure, the silica gels supply moisture. The silica gels thus create the environment where household insect pests cannot survive. Moreover, by exposing invading insect pests to silica-gel particles, the pests' tissues are physiologically decayed, and the population density of the insect pests is decreased. Insect pests in the structure can be thus controlled using the silica gels.

Abstract: Specific inorganic silica gels are used as an adsorbent drying agent for controlling insect pests in a structure. When it is too humid in the structure, the silica gels adsorb moisture. On the other hand, when it is too dry in the structure, the silica gels supply moisture. The silica gels thus create the environment where household insect pests cannot survive. Moreover, by exposing invading insect pests to silica-gel particles, the pests' tissues are physiologically decayed, and the population density of the insect pests is decreased. Insect pests in the structure can by thus controlled using the silica gels.