Lidl Lietuva - kainos lietuviškos

Skandalas Lietuvoje - netikėtai paaiškėjo, kad Lietuvos LIDL'e kainos lietuviškos, nes, matai, Lietuvos rinka per maža :-)

What is the gravity field of a photon?

Some time ago I asked research community about gravity of photons. Question was formulated as follows: