Top 100 presentations

1. Continuous Verb Tenses
   35286
2. Support and transport in plants
   33772
3. Anyong Tubig Anyong Lupa sa Asya
   29279
4. Elements compounds and mixtures
   25963
5. Chromosome
   21943
6. Simple Verb Tenses
   20782
7. Atomic Structure
   20170
8. Balancing Chemical Equations. Balancing redox equations
   20095
9. Periodic Behavior
   19868
10. Newton’s laws of motion
    18817
11. Periodic Trends
    16732
12. Adverbs
    16632
13. Percent Composition, Empirical and Molecular Formulas
    15961
14. Animal Farm
    15762
15. Bonding, Molecular Shape & Structure
    14712
16. Circulation and Gas Exchange
    13382
17. MakingFood
    13376
18. DNA - An overview
    13025
19. Fungi
    12854
20. Atomic Structure and Periodic Trends
    12808
21. Volumetric
    12646
22. Feminism- Cure or Curse
    12533
23. Atomic Structure and Periodicity
    12472
24. Hormones and the Endocrine System
    12106
25. Animal Development
    12008
26. Derivation Applications of Bernoulli Principal
    11874
27. Osmoregulation and Excretion
    11434
28. Plasma Membrane-Gateway to the Cell
    10766
29. Plant Structure, Growth, and Development
    10679
30. Acid, bases and salts
    10213
31. Development
    10179
32. Mirrors and Lenses
    10108
33. Structure of the Atom
    9917
34. Balanced forces
    9882
35. Ancient Civilizations
    9799
36. Mass Spectrometry
    9745
37. Pronouns
    9722
38. Nouns
    9662
39. Resource Acquisition and Transport in Vascular Plants
    9456
40. Forests
    9368
41. Support and transport in plants
    9322
42. Atomic Structure
    9283
43. Cell Types and Cell Structure
    8977
44. Newton’s third law of motion
    8908
45. Animal Nutrition
    8665
46. Transplantation Immunology
    8603
47. Cellular respiration
    8490
48. Growing Plants
    8333
49. Sensory and Motor Mechanisms
    8297
50. Electrical Circuits
    8230
51. Plant Responses to Internal and External Signals
    8097
52. Lab Equipment
    8020
53. Prepositions
    7966
54. Viruses, Viroids, and Prions
    7865
55. Neurons, Synapses, and Signaling
    7841
56. Of Mice and Men
    7794
57. A Tour of the Cell
    7665
58. Basic Structure of a Cell
    7641
59. Real time PCR and it's functions in diagnosis
    7590
60. Covalent Bonding (Molecules)
    7573
61. Plant structure adaptations and responses
    7532
62. Ionic Bonding
    7435
63. Cellular Division
    7410
64. Mendelian Genetics
    7052
65. To Kill a Mockingbird
    7041
66. Blood Type Genetics
    7004
67. Satellite Orbits and Uses NIS
    6995
68. Molecules and Ions
    6902
69. Well logging The Bore Hole
    6881
70. Sound
    6834
71. The Immune System
    6800
72. Membrane Structure and Function
    6717
73. Animal Reproduction
    6690
74. The Chemistry of Acids and Bases
    6641
75. Angiosperm Reproduction and Biotechnology
    6624
76. Rocks
    6596
77. Plant Diversity
    6558
78. Mendel and the Gene Idea
    6553
79. Cell Communication
    6492
80. Balancing Chemical Equations
    6473
81. Rate Laws
    6349
82. Drama
    6310
83. Hybridization of Orbitals
    6294
84. Introduction to Oscillations and Simple Harmonic Motion
    6289
85. The Building Blocks of Matter Atoms
    6219
86. Empirical Formula
    6203
87. Electron Quantum Numbers
    6146
88. An Introduction to Metabolism
    6098
89. Translation. Protein from RNA
    6079
90. Neurons
    6020
91. The Structure and Function of Large Biological Molecules
    5927
92. The Mole
    5896
93. Photosynthesis
    5869
94. Cell Membrane + Tissues & Organs Definitions
    5863
95. Earthquakes
    5826
96. Karyotypes
    5822
97. ADP, ATP and Cellular Respiration
    5789
98. Endocrine System
    5748
99. Classical greek philosophy
    5666
100. Population Ecology
     5625

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)