Yes, imagine someone of the future finds one of our concrete buildings and wonders how we moved them there in one piece, lol.
But here is an other interesting article about a hypothesis of a different gravity in the past.
It's about dinosaurs, giant plants and stuff like that.
Maybe your giants really existed in the past, but it's unlikely that they can come back.
Saturnian CosmologyPart 1 - The Golden Mesozoic Age
Thesis: We propose that Earth was a satellite of Saturn, or more
correctly a body which the ancients identified as Ouranus and which we
shall refer to as proto-Saturn. The present day Saturn is all that
remains of the once larger primary which we orbited as the closest and
innermost satellite
The most obvious characteristic of Mesozoic flora and fauna was the
upper limit of size. Pangaea's forests contained giant lycopods,
horsetails and pteridophytes, trees over 100m in height. Today the
survivors of these primitive groups are mostly small plants; the
tallest fern is only 20m high, and height is only achieved by the
conifers and flowering plant trees with specially strengthened trunks
and good root systems[26]. The dinosaurs produced the largest
terrestrial animals the world has ever known. Some weighed more than
80 tonnes, as much as 20 large elephants, but old views that they were
slow, clumsy animals have been superseded by evidence that they were
fast, active and probably warm-blooded[27],[28]. The weight which a
column can support varies as the cube of its linear dimensions[29] and
therefore the heavier the animal, the proportionally shorter and
thicker the limb bones. The dimensions of an elephant's limb bones are
approaching the maximum limits of size which physical forces permit
and are already tending towards disproportionate thickness[30]. Yet
dinosaurs were of such a degree of magnitude heavier, that the larger
herbivorous sauropods were traditionally thought of as wallowing
permanently in swamps to take the weight off their feet[31][32].
However, there is evidence that they were completely terrestrial[33]
and the large, bipedal carnosaurs, such as Tyrannosaurus, were
manifestly built for running with hind limbs more slender in
proportion to their bulk than those of an elephant. If gravity were
less, then animals could be larger and still be active with relatively
more slender limbs than an elephant[34]. The Pterosaurs, or flying
reptiles, are another case in point. Fossil specimens with wing spans
up to 8m were once regarded to be at the limit of size for any
airborne creature, even given that their bone structure was even
lighter and stronger size for size than modern birds. Then
Quetzalcoatlus specimens were found with wing spans up to 15.5m and
pronounced at beyond the engineering limits for a living flying
machine[35]. Recent considerations of the circulatory systems of the
larger dinosaurs suggest that the normal heart/lung construction would
be insufficient to keep the brain supplied with oxygenated blood[36].
The problem of explaining away the apparent defiance of physical laws
by so many of the Mesozoic plants and animals is solved easily by an
assumption of lowered gravity. Is it just coincidence that such forms
of life should be abundant at the very period when all the continental
areas were grouped into one land mass ?
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